Which is most appropriate?

I need some help!

I've just about completed Sonora Symphony (The Facts and Legends of the Sonora Desert) and want to know what everybody thinks the Point of View should be.

The piece is creative or narrative non-fiction about a just-retired Army sergeant who stops in Gila Bend, New Mexico and meets a member of the Papago tribe who is a retired professor of Native American Anthropology. He recognized the MC as a soldier and they strike up a friendship. The Professor take the MC to his home and, over an unidentified period, shows him the life and beauty of the Sonora Desert along with the history and lore of the people who live in the Southwest.

The Blood Stone by Irvin Morris about a Navajo legend is writted in First Person past tense.

Some others books I've recently read are written in Third Person past tense.